Fizz Browser: fix precomputed chunk being cleared on Node 18 #25645
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feedthejim
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Nov 11, 2022
| <AsyncText text="AAAA" /> | ||
| <link rel="stylesheet" href="AAAA" precedence="AAAA" /> | ||
| // @gate enableFloat | ||
| it('boundary style resource dependencies hoist to a parent boundary when flushed inline', async () => { |
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this test fails on the browser version @gnoff, I'm not sure if it's a bug on Float or because of the way I wrapped the streams
feedthejim
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Nov 11, 2022
| ReactDOM.preload('foo', {as: 'style'}); | ||
| }, []); | ||
| return 'foobar'; | ||
| function renderToPipeableStream(jsx, options) { |
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this is the relevant change to review in this file
gnoff
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Nov 15, 2022
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| ReactDOMFizzServer = | ||
| runtime === 'node' | ||
| ? require('react-dom/server') | ||
| : require('react-dom/server.browser'); |
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Suggested change
| ReactDOMFizzServer = | |
| runtime === 'node' | |
| ? require('react-dom/server') | |
| : require('react-dom/server.browser'); | |
| ReactDOMFizzServer = | |
| runtime === 'browser' | |
| ? require('react-dom/server.browser') | |
| : require('react-dom/server'); |
maybe check browser explicitly since the fact that node is default is maybe going to change
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| streamPromise.then(stream => | ||
| stream.pipeTo( | ||
| nodeWriteableStreamToWebWritableStream(destination), | ||
| ), | ||
| ); | ||
| return destination; |
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It is interesting that this didn't change any test behaviors. For the node runtime you can pipe even before the shell is ready. but in the web stream case we can't start the pipe until the stream promise resolves which happens after the shell is ready. Maybe it doesn't matter too much because nothing flushes until the shell is ready so the early pipe is functionally equivalent. My guess is when we implement preamble this might need to be refactored again.
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| ReactDOMFizzServer = | ||
| runtime === 'node' | ||
| ? require('react-dom/server') | ||
| : require('react-dom/server.browser'); |
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This actually may not work for Jest. We need to come up with another way to fully exercise our tests in a variety of runtimes but this may not be the right approach. Do you have insight into how to resolve the test failures that are occurring?
cc @sebmarkbage would be good to get your insight on what Jimmy should do for tests for this kind of change. I love the ambition here but I know there are a lot of complications when trying to import from more than one runtime in a single test file
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I've removed the tests so we can land this quickly, we can follow up on the test setup another time. cc @sebmarkbage |
gaearon
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Nov 21, 2022
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Nov 23, 2022
Update pre-compiled react to fix the streaming issue with node 18. x-ref: facebook/react#25645 Fixes: #42466 Manually tested locally works for the reproduction from the issue ## Bug - [x] Related issues linked using `fixes #number` - [ ] Integration tests added - [ ] Errors have a helpful link attached, see [`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)
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Nov 26, 2022
…k#25645) ## Edit Went for another approach after talking with @gnoff. The approach is now: - add a dev-only error when a precomputed chunk is too big to be written - suggest to copy it before passing it to `writeChunk` This PR also includes porting the React Float tests to use the browser build of Fizz so that we can test it out on that environment (which is the one used by next). <!-- Thanks for submitting a pull request! We appreciate you spending the time to work on these changes. Please provide enough information so that others can review your pull request. The three fields below are mandatory. Before submitting a pull request, please make sure the following is done: 1. Fork [the repository](https://github.com/facebook/react) and create your branch from `main`. 2. Run `yarn` in the repository root. 3. If you've fixed a bug or added code that should be tested, add tests! 4. Ensure the test suite passes (`yarn test`). Tip: `yarn test --watch TestName` is helpful in development. 5. Run `yarn test --prod` to test in the production environment. It supports the same options as `yarn test`. 6. If you need a debugger, run `yarn debug-test --watch TestName`, open `chrome://inspect`, and press "Inspect". 7. Format your code with [prettier](https://github.com/prettier/prettier) (`yarn prettier`). 8. Make sure your code lints (`yarn lint`). Tip: `yarn linc` to only check changed files. 9. Run the [Flow](https://flowtype.org/) type checks (`yarn flow`). 10. If you haven't already, complete the CLA. Learn more about contributing: https://reactjs.org/docs/how-to-contribute.html --> ## Summary Someone reported [a bug](vercel/next.js#42466) in Next.js that pointed to an issue with Node 18 in the streaming renderer when using importing a CSS module where it only returned a malformed bootstraping script only after loading the page once. After investigating a bit, here's what I found: - when using a CSS module in Next, we go into this code path, which writes the aforementioned bootstrapping script https://github.com/facebook/react/blob/5f7ef8c4cbe824ef126a947b7ae0e1c07b143357/packages/react-dom-bindings/src/server/ReactDOMServerFormatConfig.js#L2443-L2447 - the reason for the malformed script is that `completeBoundaryWithStylesScript1FullBoth` is emptied after the call to `writeChunk` - it gets emptied in `writeChunk` because we stream the chunk directly without copying it in this codepath https://github.com/facebook/react/blob/a438590144d2ad40865b58e0c0e69595fc1aa377/packages/react-server/src/ReactServerStreamConfigBrowser.js#L63 - the reason why it only happens from Node 18 is because the Webstreams APIs are available natively from that version and in their implementation, [`enqueue` transfers the array buffer ownership](https://github.com/nodejs/node/blob/9454ba6138d11e8a4d18b073de25781cad4bd2c8/lib/internal/webstreams/readablestream.js#L2641), thus making it unavailable/empty for subsequent calls. In older Node versions, we don't encounter the bug because we are using a polyfill in Next.js, [which does not implement properly the array buffer transfer behaviour](https://cs.github.com/MattiasBuelens/web-streams-polyfill/blob/d354a7457ca8a24030dbd0a135ee40baed7c774d/src/lib/abstract-ops/ecmascript.ts#L16). I think the proper fix for this is to clone the array buffer before enqueuing it. (we do this in the other code paths in the function later on, see ```((currentView: any): Uint8Array).set(bytesToWrite, writtenBytes);``` ## How did you test this change? Manually tested by applying the change in the compiled Next.js version. <!-- Demonstrate the code is solid. Example: The exact commands you ran and their output, screenshots / videos if the pull request changes the user interface. How exactly did you verify that your PR solves the issue you wanted to solve? If you leave this empty, your PR will very likely be closed. --> Co-authored-by: Sebastian Markbage <sebastian@calyptus.eu>
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…k#25645) ## Edit Went for another approach after talking with @gnoff. The approach is now: - add a dev-only error when a precomputed chunk is too big to be written - suggest to copy it before passing it to `writeChunk` This PR also includes porting the React Float tests to use the browser build of Fizz so that we can test it out on that environment (which is the one used by next). <!-- Thanks for submitting a pull request! We appreciate you spending the time to work on these changes. Please provide enough information so that others can review your pull request. The three fields below are mandatory. Before submitting a pull request, please make sure the following is done: 1. Fork [the repository](https://github.com/facebook/react) and create your branch from `main`. 2. Run `yarn` in the repository root. 3. If you've fixed a bug or added code that should be tested, add tests! 4. Ensure the test suite passes (`yarn test`). Tip: `yarn test --watch TestName` is helpful in development. 5. Run `yarn test --prod` to test in the production environment. It supports the same options as `yarn test`. 6. If you need a debugger, run `yarn debug-test --watch TestName`, open `chrome://inspect`, and press "Inspect". 7. Format your code with [prettier](https://github.com/prettier/prettier) (`yarn prettier`). 8. Make sure your code lints (`yarn lint`). Tip: `yarn linc` to only check changed files. 9. Run the [Flow](https://flowtype.org/) type checks (`yarn flow`). 10. If you haven't already, complete the CLA. Learn more about contributing: https://reactjs.org/docs/how-to-contribute.html --> ## Summary Someone reported [a bug](vercel/next.js#42466) in Next.js that pointed to an issue with Node 18 in the streaming renderer when using importing a CSS module where it only returned a malformed bootstraping script only after loading the page once. After investigating a bit, here's what I found: - when using a CSS module in Next, we go into this code path, which writes the aforementioned bootstrapping script https://github.com/facebook/react/blob/5f7ef8c4cbe824ef126a947b7ae0e1c07b143357/packages/react-dom-bindings/src/server/ReactDOMServerFormatConfig.js#L2443-L2447 - the reason for the malformed script is that `completeBoundaryWithStylesScript1FullBoth` is emptied after the call to `writeChunk` - it gets emptied in `writeChunk` because we stream the chunk directly without copying it in this codepath https://github.com/facebook/react/blob/a438590144d2ad40865b58e0c0e69595fc1aa377/packages/react-server/src/ReactServerStreamConfigBrowser.js#L63 - the reason why it only happens from Node 18 is because the Webstreams APIs are available natively from that version and in their implementation, [`enqueue` transfers the array buffer ownership](https://github.com/nodejs/node/blob/9454ba6138d11e8a4d18b073de25781cad4bd2c8/lib/internal/webstreams/readablestream.js#L2641), thus making it unavailable/empty for subsequent calls. In older Node versions, we don't encounter the bug because we are using a polyfill in Next.js, [which does not implement properly the array buffer transfer behaviour](https://cs.github.com/MattiasBuelens/web-streams-polyfill/blob/d354a7457ca8a24030dbd0a135ee40baed7c774d/src/lib/abstract-ops/ecmascript.ts#L16). I think the proper fix for this is to clone the array buffer before enqueuing it. (we do this in the other code paths in the function later on, see ```((currentView: any): Uint8Array).set(bytesToWrite, writtenBytes);``` ## How did you test this change? Manually tested by applying the change in the compiled Next.js version. <!-- Demonstrate the code is solid. Example: The exact commands you ran and their output, screenshots / videos if the pull request changes the user interface. How exactly did you verify that your PR solves the issue you wanted to solve? If you leave this empty, your PR will very likely be closed. --> Co-authored-by: Sebastian Markbage <sebastian@calyptus.eu>
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…k#25645) ## Edit Went for another approach after talking with @gnoff. The approach is now: - add a dev-only error when a precomputed chunk is too big to be written - suggest to copy it before passing it to `writeChunk` This PR also includes porting the React Float tests to use the browser build of Fizz so that we can test it out on that environment (which is the one used by next). <!-- Thanks for submitting a pull request! We appreciate you spending the time to work on these changes. Please provide enough information so that others can review your pull request. The three fields below are mandatory. Before submitting a pull request, please make sure the following is done: 1. Fork [the repository](https://github.com/facebook/react) and create your branch from `main`. 2. Run `yarn` in the repository root. 3. If you've fixed a bug or added code that should be tested, add tests! 4. Ensure the test suite passes (`yarn test`). Tip: `yarn test --watch TestName` is helpful in development. 5. Run `yarn test --prod` to test in the production environment. It supports the same options as `yarn test`. 6. If you need a debugger, run `yarn debug-test --watch TestName`, open `chrome://inspect`, and press "Inspect". 7. Format your code with [prettier](https://github.com/prettier/prettier) (`yarn prettier`). 8. Make sure your code lints (`yarn lint`). Tip: `yarn linc` to only check changed files. 9. Run the [Flow](https://flowtype.org/) type checks (`yarn flow`). 10. If you haven't already, complete the CLA. Learn more about contributing: https://reactjs.org/docs/how-to-contribute.html --> ## Summary Someone reported [a bug](vercel/next.js#42466) in Next.js that pointed to an issue with Node 18 in the streaming renderer when using importing a CSS module where it only returned a malformed bootstraping script only after loading the page once. After investigating a bit, here's what I found: - when using a CSS module in Next, we go into this code path, which writes the aforementioned bootstrapping script https://github.com/facebook/react/blob/5f7ef8c4cbe824ef126a947b7ae0e1c07b143357/packages/react-dom-bindings/src/server/ReactDOMServerFormatConfig.js#L2443-L2447 - the reason for the malformed script is that `completeBoundaryWithStylesScript1FullBoth` is emptied after the call to `writeChunk` - it gets emptied in `writeChunk` because we stream the chunk directly without copying it in this codepath https://github.com/facebook/react/blob/a438590144d2ad40865b58e0c0e69595fc1aa377/packages/react-server/src/ReactServerStreamConfigBrowser.js#L63 - the reason why it only happens from Node 18 is because the Webstreams APIs are available natively from that version and in their implementation, [`enqueue` transfers the array buffer ownership](https://github.com/nodejs/node/blob/9454ba6138d11e8a4d18b073de25781cad4bd2c8/lib/internal/webstreams/readablestream.js#L2641), thus making it unavailable/empty for subsequent calls. In older Node versions, we don't encounter the bug because we are using a polyfill in Next.js, [which does not implement properly the array buffer transfer behaviour](https://cs.github.com/MattiasBuelens/web-streams-polyfill/blob/d354a7457ca8a24030dbd0a135ee40baed7c774d/src/lib/abstract-ops/ecmascript.ts#L16). I think the proper fix for this is to clone the array buffer before enqueuing it. (we do this in the other code paths in the function later on, see ```((currentView: any): Uint8Array).set(bytesToWrite, writtenBytes);``` ## How did you test this change? Manually tested by applying the change in the compiled Next.js version. <!-- Demonstrate the code is solid. Example: The exact commands you ran and their output, screenshots / videos if the pull request changes the user interface. How exactly did you verify that your PR solves the issue you wanted to solve? If you leave this empty, your PR will very likely be closed. --> Co-authored-by: Sebastian Markbage <sebastian@calyptus.eu>
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Summary: Three problems popped up during the sync: - facebook/react@07f46ecf2 breaks breaks tests - facebook/react@6fb8133ed breaks fbsource tests. I added a workaround and created a test for the team that owns the test. - https://fb.workplace.com/groups/flowlang/permalink/1198137807458547/ enables local type interference in fbsource but not in github React repo and some code breaks. Addressed in facebook/react#26064 This sync includes the following changes: - **[17f6912a4](facebook/react@17f6912a4 )**: Add flow types to ReactFiberHooks ([#25752](facebook/react#25752)) //<Samuel Susla>// - **[f101c2d0d](facebook/react@f101c2d0d )**: Remove Reconciler fork (2/2) ([#25775](facebook/react#25775)) //<Jan Kassens>// - **[420f0b7fa](facebook/react@420f0b7fa )**: Remove Reconciler fork (1/2) ([#25774](facebook/react#25774)) //<Jan Kassens>// - **[3ba7add60](facebook/react@3ba7add60 )**: Allow async blocks in `to(Error|Warn)Dev` ([#25338](facebook/react#25338)) //<Sebastian Silbermann>// - **[fa11bd6ec](facebook/react@fa11bd6ec )**: [ServerRenderer] Add option to send instructions as data attributes ([#25437](facebook/react#25437)) //<mofeiZ>// - **[e98225485](facebook/react@e98225485 )**: Add ref cleanup function ([#25686](facebook/react#25686)) //<Samuel Susla>// - **[15557fa67](facebook/react@15557fa67 )**: [Fix] properly track `useId` use in StrictMode in development ([#25713](facebook/react#25713)) //<Josh Story>// - **[8a23def32](facebook/react@8a23def32 )**: Resubmit Add HydrationSyncLane ([#25711](facebook/react#25711)) //<Tianyu Yao>// - **[2655c9354](facebook/react@2655c9354 )**: Fizz Browser: fix precomputed chunk being cleared on Node 18 ([#25645](facebook/react#25645)) //<Jimmy Lai>// - **[c08d8b804](facebook/react@c08d8b804 )**: Revert "Add SyncHydrationLane" ([#25708](facebook/react#25708)) //<Tianyu Yao>// - **[56ffca8b9](facebook/react@56ffca8b9 )**: Add Bun streaming server renderer ([#25597](facebook/react#25597)) //<Colin McDonnell>// - **[f31005d6a](facebook/react@f31005d6a )**: Add SyncHydrationLane ([#25698](facebook/react#25698)) //<Tianyu Yao>// - **[f284d9faf](facebook/react@f284d9faf )**: Track ThenableState alongside other hooks //<Andrew Clark>// - **[6b4c0314e](facebook/react@6b4c0314e )**: Check thenable instead of thenableState //<Andrew Clark>// - **[33e3d2878](facebook/react@33e3d2878 )**: Reuse hooks when replaying a suspended component //<Andrew Clark>// - **[4387d752d](facebook/react@4387d752d )**: Allow more hooks to be added when replaying mount //<Andrew Clark>// - **[5eb78d0a0](facebook/react@5eb78d0a0 )**: Pass ThenableState to replaySuspendedUnitOfWork //<Andrew Clark>// - **[4a2d86bdd](facebook/react@4a2d86bdd )**: Don't reset work loop until stack is unwound //<Andrew Clark>// - **[9dfbd9fa9](facebook/react@9dfbd9fa9 )**: use: Don't suspend if there are pending updates //<Andrew Clark>// - **[44c4e6f4d](facebook/react@44c4e6f4d )**: Force unwind work loop during selective hydration ([#25695](facebook/react#25695)) //<Andrew Clark>// - **[7b17f7bbf](facebook/react@7b17f7bbf )**: Enable warning for defaultProps on function components for everyone ([#25699](facebook/react#25699)) //<Sebastian Markbåge>// - **[6fb8133ed](facebook/react@6fb8133ed )**: Turn on string ref deprecation warning for everybody (not codemoddable) ([#25383](facebook/react#25383)) //<Sebastian Silbermann>// - **[07f46ecf2](facebook/react@07f46ecf2 )**: Turn on key spread warning in jsx-runtime for everyone ([#25697](facebook/react#25697)) //<Sebastian Markbåge>// - **[d65b88d03](facebook/react@d65b88d03 )**: Eagerly initialize an mutable object for instance.refs ([#25696](facebook/react#25696)) //<Sebastian Markbåge>// - **[c343f8025](facebook/react@c343f8025 )**: [react-float] feature detect getRootNode ([#25689](facebook/react#25689)) //<Jan Kassens>// - **[e1dd0a2f5](facebook/react@e1dd0a2f5 )**: Remove recoverable error when a sync update flows into a dehydrated boundary ([#25692](facebook/react#25692)) //<Sebastian Markbåge>// - **[c54e3541b](facebook/react@c54e3541b )**: [DevTools] bug fix for Hydrating fibers ([#25663](facebook/react#25663)) //<Mengdi Chen>// Changelog: [General][Changed] - React Native sync for revisions d1e35c7...17f6912 jest_e2e[run_all_tests] Reviewed By: makovkastar Differential Revision: D42804802 fbshipit-source-id: 6a9f00724cc73378025bbd04edb2d17760a87280
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Summary: Three problems popped up during the sync: - facebook/react@07f46ecf2 breaks breaks tests - facebook/react@6fb8133ed breaks fbsource tests. I added a workaround and created a test for the team that owns the test. - https://fb.workplace.com/groups/flowlang/permalink/1198137807458547/ enables local type interference in fbsource but not in github React repo and some code breaks. Addressed in facebook/react#26064 This sync includes the following changes: - **[17f6912a4](facebook/react@17f6912a4 )**: Add flow types to ReactFiberHooks ([facebook#25752](facebook/react#25752)) //<Samuel Susla>// - **[f101c2d0d](facebook/react@f101c2d0d )**: Remove Reconciler fork (2/2) ([facebook#25775](facebook/react#25775)) //<Jan Kassens>// - **[420f0b7fa](facebook/react@420f0b7fa )**: Remove Reconciler fork (1/2) ([facebook#25774](facebook/react#25774)) //<Jan Kassens>// - **[3ba7add60](facebook/react@3ba7add60 )**: Allow async blocks in `to(Error|Warn)Dev` ([facebook#25338](facebook/react#25338)) //<Sebastian Silbermann>// - **[fa11bd6ec](facebook/react@fa11bd6ec )**: [ServerRenderer] Add option to send instructions as data attributes ([facebook#25437](facebook/react#25437)) //<mofeiZ>// - **[e98225485](facebook/react@e98225485 )**: Add ref cleanup function ([facebook#25686](facebook/react#25686)) //<Samuel Susla>// - **[15557fa67](facebook/react@15557fa67 )**: [Fix] properly track `useId` use in StrictMode in development ([facebook#25713](facebook/react#25713)) //<Josh Story>// - **[8a23def32](facebook/react@8a23def32 )**: Resubmit Add HydrationSyncLane ([facebook#25711](facebook/react#25711)) //<Tianyu Yao>// - **[2655c9354](facebook/react@2655c9354 )**: Fizz Browser: fix precomputed chunk being cleared on Node 18 ([facebook#25645](facebook/react#25645)) //<Jimmy Lai>// - **[c08d8b804](facebook/react@c08d8b804 )**: Revert "Add SyncHydrationLane" ([facebook#25708](facebook/react#25708)) //<Tianyu Yao>// - **[56ffca8b9](facebook/react@56ffca8b9 )**: Add Bun streaming server renderer ([facebook#25597](facebook/react#25597)) //<Colin McDonnell>// - **[f31005d6a](facebook/react@f31005d6a )**: Add SyncHydrationLane ([facebook#25698](facebook/react#25698)) //<Tianyu Yao>// - **[f284d9faf](facebook/react@f284d9faf )**: Track ThenableState alongside other hooks //<Andrew Clark>// - **[6b4c0314e](facebook/react@6b4c0314e )**: Check thenable instead of thenableState //<Andrew Clark>// - **[33e3d2878](facebook/react@33e3d2878 )**: Reuse hooks when replaying a suspended component //<Andrew Clark>// - **[4387d752d](facebook/react@4387d752d )**: Allow more hooks to be added when replaying mount //<Andrew Clark>// - **[5eb78d0a0](facebook/react@5eb78d0a0 )**: Pass ThenableState to replaySuspendedUnitOfWork //<Andrew Clark>// - **[4a2d86bdd](facebook/react@4a2d86bdd )**: Don't reset work loop until stack is unwound //<Andrew Clark>// - **[9dfbd9fa9](facebook/react@9dfbd9fa9 )**: use: Don't suspend if there are pending updates //<Andrew Clark>// - **[44c4e6f4d](facebook/react@44c4e6f4d )**: Force unwind work loop during selective hydration ([facebook#25695](facebook/react#25695)) //<Andrew Clark>// - **[7b17f7bbf](facebook/react@7b17f7bbf )**: Enable warning for defaultProps on function components for everyone ([facebook#25699](facebook/react#25699)) //<Sebastian Markbåge>// - **[6fb8133ed](facebook/react@6fb8133ed )**: Turn on string ref deprecation warning for everybody (not codemoddable) ([facebook#25383](facebook/react#25383)) //<Sebastian Silbermann>// - **[07f46ecf2](facebook/react@07f46ecf2 )**: Turn on key spread warning in jsx-runtime for everyone ([facebook#25697](facebook/react#25697)) //<Sebastian Markbåge>// - **[d65b88d03](facebook/react@d65b88d03 )**: Eagerly initialize an mutable object for instance.refs ([facebook#25696](facebook/react#25696)) //<Sebastian Markbåge>// - **[c343f8025](facebook/react@c343f8025 )**: [react-float] feature detect getRootNode ([facebook#25689](facebook/react#25689)) //<Jan Kassens>// - **[e1dd0a2f5](facebook/react@e1dd0a2f5 )**: Remove recoverable error when a sync update flows into a dehydrated boundary ([facebook#25692](facebook/react#25692)) //<Sebastian Markbåge>// - **[c54e3541b](facebook/react@c54e3541b )**: [DevTools] bug fix for Hydrating fibers ([facebook#25663](facebook/react#25663)) //<Mengdi Chen>// Changelog: [General][Changed] - React Native sync for revisions d1e35c7...17f6912 jest_e2e[run_all_tests] Reviewed By: makovkastar Differential Revision: D42804802 fbshipit-source-id: 6a9f00724cc73378025bbd04edb2d17760a87280
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Edit
Went for another approach after talking with @gnoff. The approach is now:
writeChunkThis PR also includes porting the React Float tests to use the browser build of Fizz so that we can test it out on that environment (which is the one used by next).
Summary
Someone reported a bug in Next.js that pointed to an issue with Node 18 in the streaming renderer when using importing a CSS module where it only returned a malformed bootstraping script only after loading the page once.
After investigating a bit, here's what I found:
react/packages/react-dom-bindings/src/server/ReactDOMServerFormatConfig.js
Lines 2443 to 2447 in 5f7ef8c
completeBoundaryWithStylesScript1FullBothis emptied after the call towriteChunkwriteChunkbecause we stream the chunk directly without copying it in this codepathreact/packages/react-server/src/ReactServerStreamConfigBrowser.js
Line 63 in a438590
enqueuetransfers the array buffer ownership, thus making it unavailable/empty for subsequent calls. In older Node versions, we don't encounter the bug because we are using a polyfill in Next.js, which does not implement properly the array buffer transfer behaviour.I think the proper fix for this is to clone the array buffer before enqueuing it. (we do this in the other code paths in the function later on, see
((currentView: any): Uint8Array).set(bytesToWrite, writtenBytes);How did you test this change?
Manually tested by applying the change in the compiled Next.js version.